Straight line pumping jack



July 21, 1936. GRAHAM 2,048,119

STRAIGHT LINE PUMPING JACK Filed March 28, 1935 awe/mm D GRAHAM.

'a vertical path.

Patented July 21, 1936 ATENT OFFIQE STRAIGHT LINE PUMPING JACK Fred Graham, Lufkin, Tex., assignor to Lufkin Foundry & MachineCompany, a corporation Application March '28, 1935, Serial No. 13,453

'1 Claims. (01. 74403) {The invention relates to an improvement in straight line pumping jacks and particularly of the type used in lifting oil and water from wells wherein a pump is located at the bottom of'the well and is operated by means of a string of sucker rods: which are reciprocated by a suitable power mechanism and the oscillation of a walking beam. In devices of this type it is desirable to have the reciprocatory motion of the polish rod which extends from the well head occur in a perfectly straight line vertical movement. With the oscillation of a walking beam member for transmitting the power to the polish rod, however, such an arrangement is impossible unless a specific mechanism is provided. for the purpose of avoiding the oscillation of the top end of the polish rod due to the fact that the end of the walking beam oscillates in an are as it rocks about the center bearing. It is one of the objects of the present invention to provide a mechanism attachment for the Samson jpost, Walking beam, and polish rod whereby to'the polish rod. 1

A still further object of the invention 'i'sto provide a linkage mechanism whereby the various :pivotarms are so proportioned that the upper endof the polish rod is constrained to travel in Another object of the invention is to provide a linkage 'm'echanism wherein the oscillation of the end of "the walking beam is counteracted'by a proportional oscillation of a linkage mechanism to prevent the transfer of the oscillating movement to the polish rod.

A still further object of the invention is to provide a four-bar linkage arrangement for so anchoring the top of the polish rod that it is restrained to reciprocate in a vertical position.

Other and further objects of the invention will be readily apparent when the following description is considered in connection with the accompanying drawing, wherein:

Fig. 1 is a side elevation of a diagrammatic view showing a general arrangement and construction of the pumping equipment and. illustratnected thereto a string of sucker rods 2|.

ing a Samson post, walking beam and well head comection to which the invention has been applie Fig. 2 is a section taken on the line 2-2 of Fig. :1 and looking in the direction of thearrows. 5

The usual construction in pumping equipment of this type to provide a power mechanism is 111115? trated generally at 2. By means of this power mechanism rotation is imparted to the shaft 3 of the pumping unit 4. This shaft carries a suitable crank arm 5 which may have the weight 6 attached thereto, and to which the pitman rod 8 is also connected. As the shaft 3 rotates an oscillating movement is imparted to the upper end 5 of the pitman rod 8 and it is at this point that the Walking beam I2 is connected by means of the pivot shaft l3.

The walking beam I2 is mounted upon a center iron 15 which is mounted on the Samson post [6 in a manner well known in the oil fields. A 2i) walking beam rest 11 may be provided on the Samson post to support the walking beam when it is disconnected from the well head, which is indicated at 20.

The pump for raising the liquid from the Well is located at the bottom of the well and has con- These rods terminate in a polish rod section 22 which is arranged to pass through a stuifing'box 23 in the top of the well head. A polish rod hanger 25 is connected by the coupling 26 to the upper end of the polish rod. In the usual forms of the invention this hanger 25 is mounted directly on the end of the walking beam and is caused to move up anddown upon oscillation of the walking beam l2.

Needless to say that the end 26 of the walking beam [2 negotiates an arc of a circle because of the fact that it is pivoted at l5 and is caused to rock back and forth upon the center iron bearing IS. The amount of lateral movement negotiated by the end of the walking beam during its oscillation would, of course, tend to move the "polish rod section 22 to the right and to the left as viewed in Fig. 1. This causes a wear on the rod in the stufiing box 23 and it is one of the objects of this invention to avoid any such oscillation and to maintain the polish rod section 22 and the hanger 25 in the same vertical plane at all times so that the polish rod will move smoothly through the stufiing box 23.

A pair of links 30 have been provided as a connection between the pivot pin 3! mounted on top of the end 26 of the walking beam l2 and the pivot pin 32 which extends beneath the lower straddle the, walking beam l2 to form a link which is free to pivot about the pin 3| as a center.

The hanger 25 is seen in Fig. 2 as having two spaced legs 33 which are mounted on the pin 32. Between the links 30, however, an arm 35 has the pin 32 passed through the right hand end, and, as viewed in Fig.- 1, is positioned between the two legs 33 of the hanger 25. This arm 35 extends along the lower side of the walking beam I2 in a substantially horizontal position when viewed,

with the parts shown as in Fig.1.

The left hand end of this arm 35 carries a shaft or pivot pin 36 which receives theupper end of a connecting bar 31 which straddles the arm 9 and has the pin 33 passed therethrough.

t Intermediate the ends of the bar 31 is'a bearing shaft 38 whose position is fixed because of the brackets 39' which are-fixed to therwalking beam l2 between the'end 26 and the center iron The lower end of the bar 31 carries the pin or shaft 4| and'has the anchor leg 42 pivoted thereto. The left-hand end of this anchor leg 42 is pivoted at 43 to a clamp 44 which is fixed'on the links- 38 are pivoted together to formafoul- 43 and-3|; r i I The brackets39 are so positioned on the walkthe link 30 are so proportioned that when the bar linkage having the three intermediate pin pivots 4|, 36, and 32, and the two anchor shafts ing beam at the proper distance between the center iron l and end of: the beam 26 where the shaft3l is mounted, that the shaft 38 carriedby the lower end of the brackets will have movement which is directly in proportion to themovement of the pin 3| The amount of variation from a verticalplane due to the oscillation of the walking beam, however, will be less with the shaft 38 than with the pin 3|. The bar3l is so mounted 1011. the shaft 38, however, that the upper portion thereof is of greater length thanthe, lower portion, These proportions will be so arranged that when the anchor leg 42 is, held stationary because of its pivoting on the pin 43 it will cause oscillation :of the farm '38 upon oscillationof the walking beam.:" e 5 e 2 I The lengthofothe leg 42, bar 31, arm 35 and with stroke desired in orderto obtain a straight 'liftjor straight line movement of the upper end of the polish rod.

o What is claimed is:

end of the walking beam l2. These two links are best seen in end view in Fig. 2, and tend to connected to said 'post and to one end of said bar, and an arm connected to said member and the other end of said bar. 7

2. A straight lift device for connecting the oscillating end of a walking beam and the pump rod comprising a link pivoted to the beam and rod, an arm connected to the lower end of said' link; a rocker bar connected to the other end of said arm and pivotally mounted on thebeam, and an anchor leg pivoted to theootherend of I said bar.

3, A straight lift device for connectingthe oscillatlngend 'ofa walking beam and the pump rod comprising a link. pivoted to the beam and rod, an arm connected 'toithe lower end of'said V link, a-ro'cker bar connected to'the other end of said arm and pivotally mounted on the beam and ananchor leg pivoted" to the other end'of saidba'r', whereby said link is moved'by said arm in proportion to the rocking of said bar by oscillation of the beamJ r Y 4; A straight lift device for pumping rigs including a Samson post, a walking beam pivoted thereon, apump rod member pivoted adjacent theendof said beam, abracket fixed to said beam' between-said end and said post, a barpiv-f ot'ed on saidlbracket, a leg connecting one end of said bar to said Samson post, an arm connecting the other end of said bar to said member whereby said member is pivoted as said beam .ro'cksrsoi that ajstraight line pull is exerted by said member; u 5.-Inapumping installation,- a Samsonpost,

:a walking beam thereon, a, pump rod,.1inks at i -1 6; In:,;a {pumping installation; a Samson post, a iwalkingbeamthereon-,1a pump rod, links: at 0ne'.;en'd--- of said beam, means connecting said links and saidrod,--a rocking bar on said beam between said post and .1 said Iinks anarm connected between the upper end of said bar tosaid links, and a swinging member connecting the other-end of said bar to said Samsonpost. 55

.' 7;. Samson 'post', a walking beam' thereon, links pivotally mounted at one end of said beam,

a pump rod connected with said links,oan arm pivotallyjconnected ,withsaid links, an anchorleg connected with said post, and a rocking bar between saidlinks and said post connecting said legandsaidarm: 7 

